Body heat storage during physical activity is lower with hot fluid ingestion under conditions that permit full evaporation

Acta Physiologica
A R BainOllie Jay

Abstract

To assess whether, under conditions permitting full evaporation, body heat storage during physical activity measured by partitional calorimetry would be lower with warm relative to cold fluid ingestion because of a disproportionate increase in evaporative heat loss potential relative to internal heat transfer with the ingested fluid. Nine males cycled at 50% VO(2max) for 75 min at 23.6 ± 0.6 °C and 23 ± 11% RH while consuming water of either 1.5 °C, 10 °C, 37 °C or 50 °C in four 3.2 mL kg(-1) boluses. The water was administered 5 min before and 15, 30 and 45 min following the onset of exercise. No differences in metabolic heat production, sensible or respiratory heat losses (all P > 0.05) were observed between fluid temperatures. However, while the increased internal heat loss with cold fluid ingestion was paralleled by similar reductions in evaporative heat loss potential at the skin (E(sk) ) with 10 °C (P = 0.08) and 1.5 °C (P = 0.55) fluid, the increased heat load with warm (50 °C) fluid ingestion was accompanied by a significantly greater E(sk) (P = 0.04). The resultant calorimetric heat storage was lower with 50 °C water ingestion in comparison to 1.5 °C, 10 °C and 37 °C (all P < 0.05). In contrast, heat storage derived co...Continue Reading

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Citations

Jul 22, 2014·Acta Physiologica·A Bondke Persson, P B Persson
Jun 13, 2015·British Journal of Sports Medicine·S RacinaisJ D Périard
May 7, 2015·Scandinavian Journal of Medicine & Science in Sports·S RacinaisJ D Périard
May 7, 2015·Scandinavian Journal of Medicine & Science in Sports·D FilingeriG Havenith
May 7, 2015·Scandinavian Journal of Medicine & Science in Sports·P M S Tan, J K W Lee
May 24, 2015·Sports Medicine·Sébastien RacinaisJulien D Périard
Sep 4, 2016·Wilderness & Environmental Medicine·Walter S HailesBrent C Ruby
Dec 9, 2016·The Journal of Physiology·Nathan B MorrisOllie Jay
Nov 16, 2017·Medicine and Science in Sports and Exercise·Georgia K ChaselingOllie Jay
Nov 8, 2018·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Nathan B MorrisOllie Jay
Nov 30, 2018·Journal of Applied Physiology·Matthew N Cramer, Ollie Jay
Sep 26, 2017·Temperature : Multidisciplinary Biomedical Journal·Sébastien RacinaisJulien D Périard
Aug 16, 2019·Journal of Applied Physiology·Nicole T VargasZachary J Schlader
Sep 27, 2014·Medicine and Science in Sports and Exercise·Dallon T LamarcheGlen P Kenny
Aug 11, 2015·Medicine and Science in Sports and Exercise·Nathan B MorrisOllie Jay
May 16, 2015·Medicine and Science in Sports and Exercise·Anthony R BainOllie Jay
May 16, 2015·Medicine and Science in Sports and Exercise·Dallon T LamarcheGlen P Kenny
Nov 20, 2016·Temperature : Multidisciplinary Biomedical Journal·Nathan B Morris, Ollie Jay
Mar 30, 2017·Temperature : Multidisciplinary Biomedical Journal·Ollie Jay, John R Brotherhood

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